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FAIR VALUE MEASUREMENTS - Summary of Significant Unobservable Inputs used in the Fair Value Measurement of Liabilities Designated as Level 3 (Details) - Recurring - Level 3 - Warranty obligations for microinverters sold since January 1, 2014 | Sep. 30, 2021 | Dec. 31, 2020
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Profit element and risk premium |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Warranty obligations, measurement input | 15.00% | 15.00%
Credit-adjusted risk-free rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Warranty obligations, measurement input | 12.00% | 13.00%

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